Crimping-board



(No Model.)

G. E. SHAW. GRIMPING BoARD.

Patented Peb. 24, 1891.

@Homme-15.

' UNITED STATES PATENT OErIcE.,I

GEORGE EMERSON SHAV, OF BERLIN, IVISOONVSIN.

CRIMPING-BOARD.

SPECIFICATION forming part of Letters Patent No. 447,119, dated February 24, 1891.

Application filed July S, 1890. Serial No. 357,682. (No model.)

To all whom, it may concern:

Be it known that I, GEORGE EMERSON SHAW, a citizen of the United States, residing at Berlin, in the county of Green Lake and State of IVisconsin, have invented certain new and useful Improvements in Crimping-Boards; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters of reference marked thereon, which form a part of this specification.

The method now most generally employed for crimping the leather is to draw the leather over the board by means of pinchers until it is sufficiently stretched, when it is nailed to the rear edges of the board, (first on one side and then on the other,) when it is left to dry. This is obviously a crude and cumbersome way, and is not only objectionable, because of the length of time required to secure and remove the leather, but it is also disadvantageous, for the reason that it soondestroys the board and renders it unfit for use.

The present invention is designed to obviate the above-named difficulties and produce a crimping-board that will be effectual and' efficient in operation and at the same time simple and durable in construct-ion, as will be more fully hereinafter described;

In the drawings is represented by Figure l a side elevation, partly in section, of my improved board complete, and Fig. 2 a detail view of the flanged nut employed for spreading the bars.

Theinvention consists in certain novel features of construction that will be fully hereinafter described, and particularly pointed out in the claim appended.

In the drawings, the letterA designates the i crimping-board, which is of any suitable shape and material, and which is beveled, as usual, on its front edge. Secured to the rear and permit the bars a limited longitudinal movement. A nut D, tapped on a screw E, serves to spread thebars and stretch the leather, the inner end of the screw resting on the rear edge of the board. This nut works between the adjacent inclined ends of the two bars and is provided with two oppositely-inclined wings or Iianges c a, which Work in inclined grooves or notches formed in the adjacent ends 0f the bars B B. By turning the screWE the nut may be forced inward or outward, as is obvious. Fitting over the nut and correspondingly corrugated is a metallic clamp O', which is provided with an opening for the passage of the screw E, the object of this clamp being to clamp the edges of the leather securely to the nut when it is stretched.

Before stretching the bars and the nut rest against the rear edges of the board. The leather is wet and placed and smoothed over the board in the usual Way, and its edges are clamped to the stretching-strips and nuts by the clamps C C', the clamps and nuts and strips being preferably corrugated for the purpose of better grasping the leather. The desired tension is then given the Wet leather by screwing out the nut by means of its screw, which action draws the leather tightly across the instep portion of the former entirely free of all wrinkles and unevenness.

It has been found in practice advantageous to so secure the bars to the board that they may have a limited longitudinal movement thereon, in order that the bars may accommodate themselves more readily to the varying directions of the strains exerted upn the 'leather being crimped; hence the object of securing the strips to the board in the manner described and shown.

Theadvantage of the arrangement of clamps ICO shown is obvious, as the leather will be drawnl and stretched evenly and simultaneously in three different directions.

Having thus fully described my invention, what I claim is- The combination of the crimping-board, the strips BB, provided eaoh With two longitudinal slots, pins passing through each of these slots into the rear and lower edges of the board, thereby attaching the said strips thereto, a beveled nut D, fitted between the adja- 

